What happens when we die? There are two options:
We cease to exist
We continue to exist
If there is no God, it is difficult to believe that, after death, we continue to exist. Indeed, atheism implies the end of personal existence upon death. This is because life after death requires a supernatural event. There is nothing in nature that suggests persons continue to exist after dying. Continued personal existence after death is non-natural. On atheism there are no non-natural events. This is called “methodological naturalism” or “philosophical naturalism.” The methodological naturalist finds the idea of heaven absurd. But of course. Such an idea is absurd on the assumption of atheism.
But if there is a God, then continued personal existence after death is possible. It is possible if by “God” we mean an all-powerful personal being who created and sustains all there is. God, on this definition, is able to perform non-natural acts. Continued personal existence upon dying is then possible. It is certainly sensible, and far from absurd. Such an idea is plausible on the assumption of theism.
The answer to the question of life after death begins and ends with the answer to the question: Does God exist?
It is reasonable to believe that God exists.Therefore it is reasonable to believe there is life after death.